NE555 Timer-based feedback voltage

The assembly is used to delay the return of power after a power outage, this arrangement protects our equipment after a return of mains by both causes severe damage to sensitive equipment connected directly to the grid.


scheme:



PCB

Board layout

List of components:
* B1: Bridge Rectifier B380C1500
* C1: Capacitor 100nF CERAMICO, MKT, MKP
* C2: Capacitor 100uF/25V ELECTROLITICO
* C3: Capacitor 100nF CERAMICO, MKT, MKP
* C4: Capacitor 100uF/25V ELECTROLITICO
* C5: Capacitor 100nF CERAMICO, MKT, MKP
* CN1: pin terminal block 5mm, TIPO AK500 / 2
* CN2: 5mm PIN terminals, TIPO AK500 / 2
* CN3: pin terminal block 5mm, TIPO AK500 / 2
* D1: 1N4004 Diode
* D2: LED 3MM AMBAR
* D3: LED 3MM ROJO
* F1: Fuse 1A PCB with protective cover
* IC1: CMOS integrated circuit TS555CN
* IC2: Integrated Circuit LM7812CV
* R1: Resistance 220k, 1/4W
* R2: Resistance 470, 1/4W
* R3: 10k resistor, 1/4W
* R4: Resistor 1k8, 1/4W
* R5: Resistance 1k, 1/4W
* R7: 275V Varistor
* RL1-12VDC: Relay Omron G2R-2
* TR1: Transformer TR-4112 ARISTON 2.4VA 230V/12V